JPH0436418U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図乃至第７図は本考案の一実施例を示すも
ので、第１図は全体の斜視図、第２図は電気回路
図、第３図乃至第６図は異なつた回転位置におけ
る検出状態を示す側面図、第７図は検出電圧とパ
ルス信号との対応を示す図である。また、第８図
乃至第１０図は従来例を示す夫々第１図、第２図
、第７図相当図である。 図中、２１は回転板（回転体）、２２は山部（
反射光量一致部）、２３は谷部（反射光量一致部
）、２４はＬＥＤ（投光素子）、２５は第１のフ
オトトランジスタ（第１の受光素子）、２６は第
２のフオトトランジスタ（第２の受光素子）であ
る。 1 to 7 show an embodiment of the present invention, in which FIG. 1 is an overall perspective view, FIG. 2 is an electric circuit diagram, and FIGS. 3 to 6 show detection at different rotational positions. FIG. 7, a side view showing the state, is a diagram showing the correspondence between the detected voltage and the pulse signal. Moreover, FIGS. 8 to 10 are views corresponding to FIGS. 1, 2, and 7, respectively, showing conventional examples. In the figure, 21 is a rotating plate (rotating body), 22 is a mountain part (
23 is a valley (reflected light amount matching portion), 24 is an LED (light emitting element), 25 is a first phototransistor (first light receiving element), 26 is a second phototransistor (first phototransistor) 2).

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 回転体に投光する投光素子と、前記回転体の回
転方向に沿うと共に前記投光素子の光軸に対して
対称位置に配設された第１、第２の受光素子と、
前記回転体の同心円上に所定ピツチで設けられ前
記投光素子の光軸上に位置した状態でその投光素
子からの光を前記第１、第２の受光素子に均等に
反射する反射光量一致部と、前記第１、第２の受
光素子の受光レベルが同一レベルとなつたタイミ
ングを検出タイミングとする比較部とを備えたこ
とを特徴とする回転角検出装置。 a light projecting element that projects light onto a rotating body; first and second light receiving elements disposed along the rotational direction of the rotating body and symmetrically with respect to the optical axis of the light projecting element;
Reflected light amount matching that is provided at a predetermined pitch on a concentric circle of the rotary body and is positioned on the optical axis of the light projecting element and equally reflects the light from the light projecting element to the first and second light receiving elements. A rotation angle detection device comprising: a comparison section whose detection timing is a timing when light reception levels of the first and second light receiving elements become the same level.